Avengers Infinity #2, 2000
The Walkers are giant golden automated humanoid beings
Their mission brought them into direct conflict with Quasar and a group of cosmic Avengers, which included the Jack of Hearts, Thor, Photon, Moondragon, Tigra and Starfox. Servitors that responded much like the white blood cells of the humans of Earth. If a Servitor was severed, the severed pieces would form new Servitors. The servitors were also able to function outside of the Walkers bodies as well, they were used to bore into a planet's core and convert the raw materials so that they could be molded.
It is unknown if the Walker will ever seen again.